Fischer-Tropsch synthesis on molybdenum catalysts

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6313734

Dun, J W

Due to the high sulfur resistance and low coke formation, Mo catalysts have recently been suggested for industrial Fischer-Tropsch synthesis. on the other hand, Mo catalysts have been found to exhibit much lower reactivity as catalysts based on Group VIII metals. In addition, the selectivity toward useful chemical feed stock range (C2-C4) is not high enough. The goal of this research was therefore designed to investigated the feasibility of improving the reactivity and C2 to C4 selectivity of Mo catalysts. Two approaches were tried in this research: 1) development of better Mo catalysts by determining the best catalyst preparation and pretreatment conditions; and 2) modification of catalyst behaviors through the manipulation of the reaction conditions, namely the periodic operations. In the first part, optimal catalyst pretreatment conditions were established at 773 K and 4 hours reduction with flowing hydrogen. Catalyst performance was investigated against the variables of charcoal support type, precursor type, pH of the preparing solutions, preparation methods, level of metal loading and potassium promoter effect. In the second part, catalyst performance was evaluated against the periodic operation variables of time period, and duty fraction between feed CO and H2. Experimental observations in this part also provided some evidence for the possible Langmuir-Hinshelwood type mechanisms for hydrocarbons formation, and Eley-Rideal type reaction mechanisms for CO2 production.

• Research Organization: Michigan Univ., Ann Arbor (USA)
• OSTI ID: 6313734
• Country of Publication: United States
• Language: English

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